US3875671A - Device for sensing the outer dimensions of non-round workpieces - Google Patents

Device for sensing the outer dimensions of non-round workpieces Download PDF

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Publication number
US3875671A
US3875671A US391014A US39101473A US3875671A US 3875671 A US3875671 A US 3875671A US 391014 A US391014 A US 391014A US 39101473 A US39101473 A US 39101473A US 3875671 A US3875671 A US 3875671A
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United States
Prior art keywords
sensing arm
workpiece
sensing
arm
dimension
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Expired - Lifetime
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US391014A
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English (en)
Inventor
Ulrich Vetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaudt Maschinenbau GmbH
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Schaudt Maschinenbau GmbH
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Publication date
Priority claimed from DE19722244161 external-priority patent/DE2244161C3/de
Application filed by Schaudt Maschinenbau GmbH filed Critical Schaudt Maschinenbau GmbH
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/22—Feeler-pin gauges, e.g. dial gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/12—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring diameters

Definitions

  • E 17 15 I5 10 31 10' f l 4 1 i 1 has: E 10b o o o i a i ix TY l 1i I 1 r I 19 u. 21. 13 2s 26 28 an DEVICE FOR SENSING TI-IE OUTER DIMENSIONS OF NON-ROUND WORKPIECES BACKGROUND OF THE INVENTION I.
  • Field of the Invention relates to measuring devices and more particularly to an apparatus for gauging one extreme dimension of a non-round workpiece.
  • Such two arm devices have also been adapted to sense the dimensions of non-round workpieces having certain profile characteristics.
  • One such device used in the grinding of so called PC 4 profiles, operates on a separate storing system whereby the circle to be described and the previously described circle are separately stored.
  • these prior art devices are limited in use and are not suitable for the sensing of the outer dimensions of camshafts because the measuring accuracy obtainable is limited by the extent of the deviation from the base circle which is encountered. This deviation is small in the PC 4 profile, but with a greater cam lift a larger measurement excursion is required thereby reducing the capability of sensing to very close tolerances.
  • the problem of achieving suitable measuring accuracy during the grinding ofcamshafts is overcome by the present invention by providing an apparatus for gauging one extreme dimension of a non-round workpiece which disengages from the feeler mechanism at a predetermined point whereby the measuring accuracy is not adversely affected by the necessity of following the extreme lift of the cam.
  • the present invention is an apparatus for gauging one extreme dimension of a non-round workpiece comprised of a sensing arm urged by a spring means to sense the contour of a non-round workpiece.
  • the sensing arm activates a measuring feeler mechanism and is predeterminely disposed to disengage from this measuring feeler at a predetermined dimension of the workpiece whereby disengagement can be achieved if and when the actual dimension of the extreme dimension of the workpiece exceeds a desired value.
  • a releasable locking means is provided for maintaining the sensing arm in this disengaged position and also for separating the sensing arm from the workpiece upon the sensing arm reaching a maximum excursion.
  • FIG. I is a schematic presentation of the apparatus according to the present invention.
  • FIG. 2 is a cross-sectional view of the present invention shown in side elevation.
  • the apparatus incorporates a sensing arm which actuates a sensing or measuring feeler mechanism at only one extreme dimension of the workpiece, such as at the base diameter of a cam profile. Outside this extreme dimension the sensing arm disengages from the measuring feeler so that the latter need not interpret the whole deflection of the sensing arm as the sensing arm follows the lift of the cam on the camshaft.
  • the sensing arm is urged by a spring means against the camshaft until it reaches its maximum excursion, that is, the greatest deflection caused by the greatest lift in the cam profile, whereupon the sensing arm separates from the cam surface.
  • the sensing arm according to the present invention remains removed from the work piece in an inoperative state until a renewed sensing is desired at which time a suitable signal is transmitted releasing the sensing arm from its separated position to re-cngage the workpiece.
  • a rocker element is provided which is urged against a cam disc secured to the sensing arm.
  • the rocker element slides along the cam disc with an excursion of the sensing arm, it counteracts the force of the spring urging the sensing arm against the workpiece.
  • the sensing arm can follow a positive excursion of the workpiece. such as a cam, to rotate to a maximum lift, but cannot follow a negative excursion as the cam surface adjacent the sensing arm recedes to the base diameter. Only when the rocker element is raised from the cam disc can the sensing arm fall back into position on the workpiece.
  • sensing arm is pivotally mounted at 11 and comprises one arm of a two armed lever which is urged about the pivot 11 by spring means 12 in a counter-clockwise direction.
  • sensing arm 10 rotates about pivot 11, it actuates a measuring feeler mechanism comprised of plunger 17, measuring box 18 and spring 19 disposed to urge the plunger into contact with intermediate lever 15.
  • the sensing arm contacts, through support pad 20 the cam which, for example, rotates in the direction shown by arrow 22. In the position shown in FIG. 1, the support pad 20 is contacting the circumference of the base diameter of cam 21 and in this position presses through its pivotally opposite arm support pad 23 on intermediate lever 13.
  • sensing arm may continue to experience greater excursions without the measuring feeler mechanism having to be designed for a correspondingly large excursion.
  • FIG. 2 A practical construction of the preferred embodiment is shown in FIG. 2 wherein the sensing side of the sensing arm is indicated by 10b and the side of the sensing arm which engages the measuring feeler through intermediate levers 13 and 15 is indicated by 100. These arms are separable so that it is possible to conveniently select different lengths of the sensing arm 10b according to the requirements of the object to be sensed without having to alter any other part of the device. This feature also allows the sensing arm 10b to be easily exchanged in case of wear on the support pad 20.
  • Pivot 11 of the sensing arm 10 and pivot 24 of the intermediate lever 13 are formed of cross-spring joints in order to eliminate any play in the levers during operation.
  • intermediate lever 15 is mounted by leaf spring 16.
  • Cam disc 25 is mounted on arm 10a of the sensing arm to project downwardly therefrom and is provided with a curved bearing surface 26 eccentrically disposed relative to the pivot 11 of the sensing arm such that the distance between the pivot and the curved surface 26 gradually increases from upper end 27 to the lower projecting end 28.
  • Rocker element 30 contacts the curved surface through supporting ball 29 and is urged thereagainst in a manner not shown.
  • a means, such as electromagnet 31, is provided whereby rocker element 30 can be disengaged from curve 26 of cam disc 25 upon excitation of the electromagnet 31.
  • sensing arm 10 In operation, as sensing arm 10 is pivoted in a clockwise direction about pivot 11, cam disc 25 likewise rotates in a clockwise direction causing the supporting ball 29 of rocker element 30 to slide along the curve 26, and relatively to the left of FIG. 2 due to the eccentricity of that curved surface will respect to pivot 11.
  • cam disc 25 Upon reaching its maximum excursion corresponding to the maximum lift of the cam, the force of the rocker element against the curved surface of the cam disk counteracts the force of spring 12 to prevent the sensing arm from returning or drawing back in an counterclockwise direction as the cam continues to rotate. Therefore. the sensing arm remains in the maximum delfected position as shown in broken lines at 10' in FIG. 2. As can be seen in FIG. 2, in this position support pad 23 is entirely disengaged from intermediate lever 13.
  • electromagnet 31 is simply excited causing the rocker element 30 to raise from curve 26 so that the restoring force of spring 12 can return the sensing arm 10- into contact with the cam at pad 20 as is shown in FIG. 1.
  • Two devices according to the above-described invention may be used as a pair whereby cam sections of the workpiece aligned diametrically opposite one another can be sensed such that sensing is independent of any displacement in the devices.
  • the extreme dimension to be sensed is not limited to the base diameter of the cam, however, this is the dimension which will typically be sensed in the grinding of most modern camshafts.
  • Apparatus for gauging one extreme dimension of a non-round workpiece comprising a sensing arm urged by a spring means against the contour of said non-round workpiece.
  • a measuring feeler mechanism actuated by said sensing arm which is predeterminedly disposed to disengage from same upon a predetermined excursion of said sensing arm on said workpiece whereby total disengagement can be achieved if and when the actual dimension of said extreme dimension of said workpiece exceeds a desired value.
  • a releasable locking means for maintaining said sensing arm in said disengaged position by causing said sensing arm to separate from said workpiece upon reaching a maximum excursion.
  • said releasable locking means comprises a cam disc secured to project from one end of said sensing arm and having a curved bearing surface eccentrically disposed relative to the pivot of said pivotally mounted sensing arm such that the distance between said pivot and said curved surface increases toward the lower projecting end of said curved surface, and
  • sensing arm is a two armed lever.
  • Apparatus for gauging one extreme dimension of a non-round workpiece comprising a two armed, pivotally mounted sensing arm urged by a spring means against the contour of said nonround workpiece,
  • a measuring feeler mechanism actuated by said sensing arm which is predeterminedly disposed to disengage from same upon a predetermined excursion of said sensing arm on said workpiece whereby total disengagement is achieved if and when the actual dimension of said extreme dimension of said workpiece exceeds a desired value
  • At least one transmission lever having one arm disposed between said sensing arm and said measuring feeler
  • cam disc secured to project from one end of said sensing arm and having a curved bearing surface eccentrically disposed relative to the pivot of said pivotally mounted sensing arm such that the distance between said pivot and said curved surface increases toward the lower projecting end of said curved surface
  • a releasable spring loaded rocker element urged against said curved surface of said cam disc and adapted to slide thereon upon rotation of said sensing arm away from said extreme dimension of said non-round workpiece upon the rotation thereof. and further adapted to counteract the force of said spring means urging said sensing arm against said workpiece except when released, such as by means of an electromagnet, whereby the sensing arm separates from the workpiece after achieving a maximum excursion.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
US391014A 1972-09-08 1973-08-23 Device for sensing the outer dimensions of non-round workpieces Expired - Lifetime US3875671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722244161 DE2244161C3 (de) 1972-09-08 Vorrichtung zum Abtasten der Abmessungen von unrunden Werkstücken

Publications (1)

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US3875671A true US3875671A (en) 1975-04-08

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US391014A Expired - Lifetime US3875671A (en) 1972-09-08 1973-08-23 Device for sensing the outer dimensions of non-round workpieces

Country Status (4)

Country Link
US (1) US3875671A (enrdf_load_stackoverflow)
JP (1) JPS4968380A (enrdf_load_stackoverflow)
FR (1) FR2199110B3 (enrdf_load_stackoverflow)
GB (1) GB1443036A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364179A (en) * 1980-10-31 1982-12-21 Portage Machine Company Statically balanced inspection probe assembly
US6546642B1 (en) * 1998-03-13 2003-04-15 Marposs Societa' Per Azioni Head, apparatus and method for the linear dimension checking of mechanical pieces
US20070294906A1 (en) * 2006-06-23 2007-12-27 Andreas Reichhardt Electromechanical sensing device for detecting distance

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1165873B (it) 1979-10-29 1987-04-29 Finike Italiana Marposs Testa comparatrice per il controllo di dimensioni lineari di parti meccaniche
IT1133318B (it) * 1980-06-02 1986-07-09 Finike Italiana Marposs Comparatore per il controllo di dimensioni lineari di pezzi meccanici
IT1145503B (it) * 1981-04-30 1986-11-05 Finike Italiana Marposs Dispositivo di controllo a tampone per il controllo dimensionale di fori di pezzi meccanici
JPS58103308U (ja) * 1982-01-06 1983-07-14 横浜ゴム株式会社 変位センサ
FR2569474B1 (fr) * 1984-08-27 1986-12-26 Meseltron Sa Dispositif pour mesurer la position axiale d'une piece a usiner, notamment sur une machine a rectifier les surfaces cylindriques exterieures

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1928457A (en) * 1929-09-12 1933-09-26 Gen Electric Electric gauge
US2691887A (en) * 1951-11-16 1954-10-19 Leitz Ernst Gmbh Apparatus for determining the contour of interior surfaces of workpieces
US3245148A (en) * 1960-07-26 1966-04-12 Gen Motors Corp Roundness gage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1928457A (en) * 1929-09-12 1933-09-26 Gen Electric Electric gauge
US2691887A (en) * 1951-11-16 1954-10-19 Leitz Ernst Gmbh Apparatus for determining the contour of interior surfaces of workpieces
US3245148A (en) * 1960-07-26 1966-04-12 Gen Motors Corp Roundness gage

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364179A (en) * 1980-10-31 1982-12-21 Portage Machine Company Statically balanced inspection probe assembly
US6546642B1 (en) * 1998-03-13 2003-04-15 Marposs Societa' Per Azioni Head, apparatus and method for the linear dimension checking of mechanical pieces
US20030159302A1 (en) * 1998-03-13 2003-08-28 Dall'aglio Carlo Head, apparatus and method for the linear dimension checking of mechanical pieces
US6920698B2 (en) 1998-03-13 2005-07-26 Marposs, S.P.A. Head and apparatus for the linear dimension checking of mechanical pieces
US20050229419A1 (en) * 1998-03-13 2005-10-20 Dall Aglio Carlo Head and apparatus for the linear dimension checking of mechanical pieces
US7076882B2 (en) 1998-03-13 2006-07-18 Marposs Societa' Per Azioni Head and apparatus for the linear dimension checking of mechanical pieces
US20060201012A1 (en) * 1998-03-13 2006-09-14 Dall Aglio Carlo Apparatus for the linear dimension checking of mechanical pieces
US7266900B2 (en) 1998-03-13 2007-09-11 Marposs Societa' Per Azioni Apparatus for the linear dimension checking of mechanical pieces
US20070294906A1 (en) * 2006-06-23 2007-12-27 Andreas Reichhardt Electromechanical sensing device for detecting distance
US7430815B2 (en) * 2006-06-23 2008-10-07 Andreas Reichhardt Electromechanical sensing device for detecting distance

Also Published As

Publication number Publication date
DE2244161A1 (de) 1974-03-28
DE2244161B2 (de) 1976-07-01
JPS4968380A (enrdf_load_stackoverflow) 1974-07-02
FR2199110B3 (enrdf_load_stackoverflow) 1976-07-30
FR2199110A1 (enrdf_load_stackoverflow) 1974-04-05
GB1443036A (en) 1976-07-21

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